Process of making a filler for rubber or paint.



- No Drawing.

UNTTED STATE% PATENT @FFTQE.

WILLIAM B. ROSEVEAR. JR., OF DETROIT MICHIGAN.

"PROCESS OF MAKING A FILLER FOR RUBBER OE lAIN'l.

T 0 all whom it may concern:

Be it known that I, \Ynmrvn E. Ross- YEAR, Jr., a citizen of the United States, residin at Detroit, county of \Vayne, State of Mlchigan, have invented a certain new and useful Improvement in Processes of Making Fillers for Rubber or Paint, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying; drawings, which form a part of this specification.

My invention relates to a process for making a filler for rubber, paint or other similar material and the product produced by said process,

Objects of my improvements are to utilize what has hitherto been a waste product and to produce a product which is cheap and.

which when incorporated with the rubber, paint, or the like shall produc a superior substance.

These objects are secured by taking the lime-cake or substance chemically precipitated in the process of purifying the juices in the manufacture of beet sugar. and pulverizing the same to reduce. the caking formed in drying. I then subject this substance to a temperature of about 500 F. for about an hour with tree access of air to the same, which I secure by continually stirring the substance while being, heated and freely supplied with air. This dryin e or roasting may be. carried out in a rotary drum with longitudinal steps to keep the substance tumbling. or with a spiral web to keep it tumbling and passing from end to end of the roaster althe same time. The temperature must be kept below (300 1; to avoid producing an undesirable. alkalinity to the product. The free. access of air is necessary to prevent the discoloring of the ma- Specification of Letters Patent.

Application filed December 9, 1916.

Patented Aug. 21, 1917.

Serial No. 135,997.

terial. The roasting temperature should be maintained as hish and for as long a time as is necessary to drive off all volatile organic 1natter.-;

By this process a ver tine tiller is produced which on being; incorporated with rubber makes a dense and serviceable article and which is very cheap and produces a superior article where ever incorporated as a tiller with other substances.

llitherto the lime-cake 0r precipitate utilized in this process has been a waste product and by this process it made very useful and valuable.

hat I claim is:

1. The process of producing a filler consisting in subjecting the precipitate produced in clarifying the juice in sugar manutacture to a degree of temperature adapted to drive il the moisture without discoloring the product.

2. A tiller prmluccd by subjecting the precipitate i'ormed in clarifying the juice in sugrja r manufacture in the presence of free access of air to a sutlicieut degree of temperature to drive ott' the moisture therefrom without discoloring the product.

3. The process of producing a filler consisting in subjecting the precipitate produced in clarit'ying the juice in sugar manufacture to a degree of temperature adapted to drive ott' the moisture and volatile organic matter without discoloring the product.

l. i\ tiller produced by subjecting the precipitate formed in claritviug the juice in sugar llHHHItzHilllt in the presence of free access of air to a sullicicut degree ot temperature to drive off the moisture and volatile, organic matter without discoloring the \VILLTAH 1%. ROSEVEAR, JR. 

